<header class="main-header">
    <a class="logo">
        <span class="logo-lg">{{problem_name}}</span>
    </a>
    <nav class="navbar navbar-static-top">
        <a href="#/" class="sidebar-toggle" data-toggle="offcanvas" role="button" style="color: white">
            首页
        </a>
        <div class="navbar-custom-menu">
            <ul class="nav navbar-nav">
            </ul>
            <ul class="nav navbar-nav" style="position: absolute; right: 100px">
            </ul>
        </div>
    </nav>
</header>
<ui-view></ui-view>
